Designed for Leupold scopes built after 2003, Alumina Flip-Back lens covers feature powerful neodymium magnets to hold them securely closed and triple O-ring seals for provide maximum protection from the elements. The cover opens silently and folds flat against the scope in the open position. Constructed out of durable 6061 T6 aircraft grade aluminum, they are precisely machined to allow for quick and easy operation, and a low-profile position, when open, make these Flip-Back lens covers stand above the rest. Round objective and ocular models can be rotated so they can open in any direction. Protect your Leupold riflescope's objective lens from rain and glare. The 3 inches lens shades can be threaded together to create custom lengths. Fits all Leupold VX-5HD, VX-3i, and Mark 5HD riflescopes with 56mm objective lenses.